Updated mirror

Taobao mirror has troubles becaus of security policies that only employees can access servers which is needed for maintenance work at Taobao. Core maintainers left Taobao recent years which cause all kinds of troubles.

Therefore, a new mirror is considered to operate separately under control of serveral core members at Ruby China. QCloud will sponsor servers and CDN from Tencent. It’s going to offer “realtime” synchronization, 400+ global CDNs and two servers operated outside China which ensures CDN server can query the data.